Many thanks to JAF430 for beta-testing and editing this puzzle and assisting with placement of the hides for ten of the eleven caches in this series!
Thanks to Butterfly_TeamBnB for catching a typo at 4-Down; it's been corrected.
SOLVE THE CROSSWORD, ENTER A KEYWORD INTO CERTITUDE,
RECEIVE COORDS FOR THE ACTUAL LOCATION OF THE HIDE
TERMINAL CRUCIVERBALISM?
ACROSS
1 Trig function
4 Small bite
7 Lymphangioleiomyomatosis (rare lung disease that usually strikes women in their prime)—for short
10 Only about 12,500 diverse family farmers in the US belong to this group, which hopes you drink milk
13 What a perk regarding your car and accompanying your ticket might grant you at a stadium?
16 Joseph, a German physical trainer who, in the early 20th century, developed a mind-body exercise
17 Zealot
18 Earth’s closest star
19 Caricaturist Thomas and business magnate Condé (who is buried near Babe Ruth and Billy Martin)
21 A bander might use one to capture birds
22 Kind of tuna that has about 120 calories, 25 grams of protein, 1 gram of fat, and zero carbohydrates
23 Marg Helgenberger still stars in this tv show about forensic investigators
24 Container name derived from the Greek phiale and Middle English fiole and viole
26 In meteorology it stands for condensation trails aloft; to the US, EU, & Canada it’s The Working Party on Transatlantic Relations
27 Close
30 Bras, binoculars, and backpacks usually have them
32 Tours of duty
34 Seasonal contraction?
35 Battery size first introduced by The American Ever Ready Company in 1911
37 Some vets might have these letters on their license plates
38 To claim the higher moral ground, what (with the) most countries don’t want to strike?
43 Fourth studio album by German band Cluster, released in 1976; Eno probably influenced Moebius and Roedelius before the album was recorded (in just two days)
45 Where Les Nessman, Dr. Johnny Fever, and Jennifer Marlowe worked?
47 With to, what most people in a line desire?
50 For short, rebel group in Uganda, South Sudan, Central Afr. Rep., and Dem. Rep. of the Congo
51 Tholes’ go-between?
54 Sodium hydride, no?
55 Member of the fam
56 Potluck events, often
60 Optical Mark Recognition (abbr)
61 Half a rum cocktail?
62 Lute that originated in Portugal but became popular in Hawaii
63 Heath in “The Big Valley” and Steve in “The Six Million Dollar Man”
64 With 49D, what NAACP, NAFTA, NASDAQ have in common?
65 Indian Hemp (poisonous to humans, dogs, cats, and horses—can cause cardiac arrest)
DOWN
1 Beret or tam
2 François’s marmoset
3 Beckett’s “Capital of the Ruins,” a martyr city of WWII named for a local saint, Laud of Coutances
4 “pity this busy monster, manunkind, ___.”
5 That part of Christian theology devoted to reconciling different denominations and sects
6 Where you’ll find a well known campanile whose lean began in the 12th century, eventually reaching 5.5 degrees before it was stabilized between 1993 and 2001
7 Uber rival
8 You jam: te ___
9 Sun follower?
10 Fruit with a long shelf life and lots of sugar, like the deglet noor
11 This crustless quiche’s eggs are whisked vigorously to a custard-like consistency
12 It currently recognizes 184 dog breeds (CKC recognizes more than 450)
14 Nicah ___, or tahleel marriage, which allows a woman divorced by triple talaq to marry another man, consummate that marriage, divorce that man, and then remarry her first husband
15 Italian sandwich made with ciabatta, rosetta, or michetta, sometimes served after grilling
20 Really satisfy
24 Audio plug-in software interface that integrates synthesizers and effects units into digital audio workstations; some of it is freeware (pl. abbr.)
25 “___ Poetica,” which includes “For love / The leaning grasses and two lights above the sea—”
28 E. M. Forster’s Howards ___
29 Request for a response to an invitation (the French now consider it too formal and old-fashioned)
31 Head of a house of friars—or a synonym of earlier
33 “Breakaway (From ___ Chains)” by The Ozark Mountain Daredevils
35 “___ ___ Lay Me Down” by Sophie B. Hawkins
36 Plastic in computer keyboards, LEGO bricks, face guards for wall sockets, & power-tool housings
38 Geocaching reviewer probably best known by GR8CACHES?
39 ___ Zoo, 1000 Elmwood Ave, Providence, RI, named for the founder of RI
40 High toss
41 Succeeded
42 Linear marks
44 St. Ignatius Loyola’s ___, an opportunity for peaceful, daily, reflective prayer, asks “Where have I felt true joy today?”
45 Scoreboard letters for league and team that began as the Milwaukee Brewers, moved to Missouri in 1902, then became the Baltimore Orioles in 1953
46 Challenge to an assertion?
48 Sherlock Holmes’ sister in a 2020 film directed by Harry Bradbeer and starring Millie Bobby Brown
49 See 64A
51 Mr. Holland’s ___, starring Richard Dreyfuss in the title role
52 Johns Hopkins-affiliated research ctr in Howard County MD employing 8000 people (some cachers!)
53 Robert who played Mike on “The Brady Bunch” (1969-1974)
56 Johnny Cash classic, “A Boy Named ___”
57 Kyiv is its cap.
58 In the postal system, what used to be called the DLO
59 Bull or boar when castrated as a mature adult


You can validate your puzzle solution with certitude.