Puzzle

 ACROSS



  1 Fictional archaeologist Croft

  5 Like Jupiter or Saturn

 10 Ride for Huck Finn

 14 Sweethearts, slangily

 15 Best effort, to a coach

 16 One may be hitched to a 19-Across

 17 *Antlered rabbits of myth

 19 Hybrid farm animal

 20 Brandeis law professor Anita

 21 ___ serif

 23 End of the Navy's URL

 24 Flavorless

 26 *1613-1917 Russian dynasty

 28 "___ the ramparts ..."

 29 Extremely eager

 33 Wipe, as a whiteboard

 34 Finger shakes

 36 Signs up

 39 *Ultrasounds, for example

 43 Meets, as a challenge

 44 Scruff

 46 Single spreadsheet cell

 49 Jacob and Esau, for Rebekah

 51 Water source

 52 *Soybean appetizer

 55 App with filters, informally

 57 Texter's "I didn't want to know that!"

 58 Sippy cup users

 60 Thick noodle variety

 61 Feels unwell

 63 Green Bay Packers fan, or a hint to the starred answers' starts

 67 Wheat is the biggest one in Kansas

 68 Throw with effort

 69 Bit of land in the sea

 70 Goddess of childbirth

 71 ___ Forces Bowl

72 Texter's "Bye for now!"

DOWN



  1 JFK's VP

  2 Roadside assistance org.

  3 Plug in, as a tablet

  4 Invite to enter

  5 Nerve

  6 Back in time

  7 Drains of energy

  8 Mudsling

  9 Binary question type

 10 Record speed meas.

 11 Spelman grad

 12 Shakespearean volumes

 13 Midnight or midday

 18 Hawkeye Pierce portrayer Alan

 22 Refine, as ore

 24 Cellist's necessity

 25 Page (through)

 27 Crime of fiery passion?

 30 Hair stiffeners

 31 "My treat!"

 32 Icky

 35 Play mindlessly

 37 "... and ___ the next!"

 38 Sphinx, in part

 40 Target, as a dartboard

 41 Tangled mess

 42 Quarrel

 45 Clean Air Act org.

 46 Break off

 47 Have high regard for

 48 Take in, perhaps

 50 One of a square's four

 53 Chocolaty latte

 54 Heavens, poetically

 56 Like a rare baseball game

 59 Sewn line

 60 Like cheaper copies of books, often

 62 Setting for a mud bath

 64 First lady?

 65 Gymnast Raisman

 66 Marina ___ Rey

Solution