Oak Tree Challenge Mystery Cache
retiredprof: In light of geocaching's recent changes to the publishing rules, I am archiving all 150 of my challenge caches. I am a retired psychology professor, not a computer programmer. I am simply unable to comply with the new geochecker rules. I am sad that I have to do this. For those who have already begun any of my challenge caches, please note that you can still log archived caches. If you have any problems with this decision, please contact the geocaching authorities so that your suggestions may be considered.
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Difficulty:
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Terrain:
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Size: 
(small)
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The cache is hidden four or five miles north of Marysville at the above-listed coordinates. You can drive within twenty yards of it, and you should be able to guess what type of tree it is hidden in (or under). In order to log this cache, you must find 25 oak tree caches, as explained below.
**********LOGGING REQUIREMENTS**********
California is noted for having the finest oak trees in the world. Your job is to find 25 caches with the word "oak" in the title [but not poison oak]. There is no time limit, you may already have found them. When logging this cache, list your requisite caches as shown below. And, when logging feel free to share your experience or opinion about the sturdy oak. Personally, I have found many fine caches in, on, or under the mighty oak. Unfortunately, tho, it seems that ants also like these trees...
1AZFW----Oak Avenue giant-------3-14-09
1899T------Oak by the river---------1-01-08
QRCM------Oaks of Mt Hood-------11-23-07
1N8RN------Oaks of Monticello---- 4-16-09
11W50------Oak hollow-------------12-05-07
134GH------Oaks near ditch-------- 5-20-08
T6JK-------...Oak Lane----------------9-11-07
1740A-------Oak lined trail-----------11-9-07
VDBK--------Oak park-----------------1-24-08
1FJ6C--------Oak patch---------------8-31-08
1HKGB------Oak tree hill--------------3-12-09
11WT3-------Oak tree park-----------4-08-07
16E96--------Oak trunk----------------3-12-09
1C6NF-------Oak way park----------12-30-08
17PYO--------Oak with a moat------12-01-07
14B72--------Big Ben Oak-------------8-15-07
1GAN1---from this a mighty Oak---12-30-08
1H^V8---------lil Oak tree-----------12-13-08
14H53-----Lincoln Oak and water---9-20-07
XGQV-------...Live Oak road----------4-06-07
18497---------Live Oak school--------12-5-08
HMT2---------Live Oak stumper-------9-30-08
1D9Y3---------Moore Oak-------------- 7-07-08
12CQX--------mossy Oak---------------4-28-07
Z801------------seven Oaks------------9-13-08
Additional Hints
(Decrypt)
czhgf