Source of rectangular lettuce?
Source of red blood cells
Source of red ink
Source of red or white
Source of refills
Source of regret, perhaps
Source of relief
Source of reminiscence
Source of resources
Source of retail profits
Source of retiree funds
Source of retiree income
Source of revenue for many states
Source of rice
Source of riches
Source of rings
Source of rings for frying
source of river
Source of river in the form of a spring
Source of Rockefeller money
Source of Rockefeller's wealth
Source of roe
Source of romantic petals
Source of roof noise
Source of rope fiber
Source of Roquefort cheese
Source of royal insomnia
Source of rubber
Source of ruin
source of rules for keeping kosher
Source of sake
Source of Sake Dish seasoned with
Source of Samson's strength
Source of sandwich seeds
Source of sap
Source of saturated fat
Source of sauce
Source of sauce or milk
Source of sauce to go with beef
Source of Scandinavian mythology
Source of scandium
Source of school stress
Source of seasonal color
Source of secondhand goods
Source of security
Source of Seoul food
Source of seven La Scala premieres
Source of shade
Source of shavings
Source of shells
Source of shower suds
Source of sibilance
Source of sign shine
Source of silky wool
Source of silver
Source of sisal hemp
Source of skin-softening oil
Source of slag
Source of smokes that are illegal in the U.S.
Source of snack seeds
Source of sodium for college students
Source of sodium from Keebler
Source of soft down
Source of soft fabric
Source of soft feathers
Source of soft wool
Source of softwood
source of soil used in varnishes
Source of solar energy
Source of solar power
Source of some '60s trips
Source of some aerial photos
Source of some allergic reactions
Source of some ambient radiation
Source of some annoying online messages
Source of some bangs
Source of some big waves
Source of some blasts
Source of some blowups
Source of some blues
Source of some brandy
Source of some bubbles
Source of some carbs
Source of some cats and carpets
Source of some clicking
Source of some clicks
Source of some coffee
Source of some crime
Source of some cruise ship beer?
Source of some cures
Source of some D.C. funding
Source of some discrimination
Source of some extracts
Source of some fertilizer
Source of some fevers
Source of some filings
Source of some flashbacks
Source of some fluff
Source of some food poisoning
Source of some foot-stomping
Source of some fruity pops
Source of some Genesis attire?
Source of some govt. checks
Source of some greens
Source of some hallucinations
Source of some health food store oil
Source of some highly prized 19-Acrosses
Source of some ice creams' crunch
Source of some inside info?
Source of some intolerance
Source of some issues?
Source of some leather
Source of some liver-based oil
Source of some long flows
Source of some lows
Source of some muddy footprints?
Source of some nectar
Source of some net receipts?
Source of some of the oil for 31-Down
Source of some omega-3s
Source of some overhead coverage
Source of some overhead footage
Source of some paper pulp
Source of some penetrating notes
Source of some plywood
Source of some pop-ups
Source of some power?
Source of some pressure
Source of some pressure, maybe
Source of some prints
Source of some private pain?: Abbr.
Source of some quilt stuffing
Source of some reactions
Source of some resins
Source of some retirement income
Source of some rings
Source of some roe
Source of some rushes
Source of some Russian copper
Source of some salt
Source of some scars
Source of some scriptures
Source of some seeds
Source of some shadows, for short
Source of some slicks
Source of some sound bites
Source of some South American wool
Source of some sprays
Source of some spring color
Source of some stings
Source of some stomachaches
Source of some strange visions
Source of some strange visions, for short
Source of some street clatter
Source of some students' stress
Source of some sugar
Source of some swelling
Source of some syrup
Source of some tadpoles
Source of some tears
Source of some tears in the kitchen
Source of some teen angst
Source of some temporary tattoos
Source of some TV content
Source of some tweets
Source of some urban pollution
Source of some USAF leaders
Source of some vinegars
Source of sordid details
Source of Souls
Source of sound advice
Source of spam
Source of sparkling wine
Source of spices for old traders
Source of spills on hills
Source of split-resistant wood
Source of sports news
Source of spousal angst, nocturnally
Source of spray
Source of springtime stress for a H.S. student
Source of spumante wine
Source of spy movie suspense
Source of start-up cash, perhaps
Source of statements
Source of stats
Source of status
Source of steadiness
Source of steam
Source of steel
Source of steel block fool contaminated with copper
Source of sticker shock
Source of sticker shock?
Source of stocks or bonds
Source of stone used to build the ancient Egyptian pyramids
Source of straw
Source of streaming video
Source of strength
Source of stress for a returning vacationer
Source of stress for new parents
Source of stress, probably
Source of strip steaks
Source of sudden understanding
Source of sudden wealth
Source of suds
Source of sugar
Source of Sun. inspiration
Source of Sun. light?
Source of Sunday music
Source of Supergirl's powers
Source of support
Source of sweat
Source of sweet sap
Source of syrup
Source of T-bones
Source of tapioca
Source of teak
Source of teen pressure
Source of teenage self-consciousness
Source of temporary funds
Source of temptation
Source of tequila
Source of the "package" that traverses the grid via the starred answers
Source of the advice
Source of the all-time best-selling movie-related toy line
Source of the Amazon
Source of the Amazon burrower
Source of the Beverly Hillbillies' wealth
Source of the brachiocephalic trunk
Source of the delicacy tomalley
source of the dragons sound in sleeping beauty
Source of the Ewing fortune
Source of the fairy-tale sequence that creates four long puzzle puns
Source of the first spare rib
Source of the fleece found by 105 Across
Source of the food thickener alginate
Source of the freedoms found at the ends of this puzzle's four other longest answers
Source of the Getty fortune
Source of the Golden Fleece
Source of the headline "Study Finds Blame Now Fastest Human Reflex," with "The"
Source of the headline "World Death Rate Holding Steady at 100 Percent," with "The"
Source of the heart stimulant digitalis
Source of the Hulk's power
Source of the idioms "fat of the land" and "fire and brimstone"
Source of the Las Vegas glow
Source of the Law
Source of the line "Blessed are the meek: for they shall inherit the earth"
Source of the line "Each of us bears his own Hell"
Source of the line "Frailty, thy name is woman!"
Source of the line "Hope springs eternal ..."
Source of the line "If this is the best of all possible worlds, what are the others?"