(Can't believe that we had never visited some of these places before. Surely our kids should have visited on field trips when younger.) As an aside, sgt has issues with the use of the word "historic" vs. "historical". Can anybody provide guidance on proper usage?
You may visit these sites in whatever order you think would be most efficient. The points are given in a west to east order.
A. N 38° 13.543 W 090° 13.987 (The posted coordinates.)
What you need for variable A:
The third digit of the year in which the original stone church discontinued German language services.
B. N 38° 14.620 W 090° 13.743
What you need for variable B:
The last three digits of the year in which the McRoberts settled this place.
C. N 38° 17.331 W 090° 11.812
What you need for variable C:
The last three digits of the year over the door.
D. N 38° 05.204 W 090° 09.498
What you need for variable D:
The day of the month in which the British occupied the fort.
E. N 38° 03.762 W 090° 03.834
What you need for variable E:
The third digit of the most recent year mentioned on the metal plaque attached to the bluff.
F. N 38° 07.904 W 089° 59.880
What you need for variable F:
The first digit on the bottom most disk of the group of four disks on the nearby (big) telephone pole.
G. N 38° 03.161 W 089° 56.002
What you need for variable G:
The number of wooden posts at this pull over.
H. N 37° 58.129 W 089° 54.645
What you need for variable H:
The number of soldiers Lewis and Clark recruited from the nearby fort.
I. N 37° 57.676 W 089° 54.340
What you need for variable I:
The last digit of the year in which the house was approximately erected.
J. N 37° 58.586 W 089° 52.814
What you need for variable J:
The number of letters on the concrete pillar next to the nearby No Passing Zone sign.
Final: N 38° X W 089° Y
X = [ ( (C * ( (G + I) - (D + A) ) ) - (G * A * A) ) + (G - (I + D) ) ] / 1000
Y = [ ( (B * ( (E * H) + F) ) - (H * (E + F) ) ) + J] / 1000

Are You Hound Enough? Version 2.0 (A Geocaching Competition)
Play along or not. In any case, enjoy the cache.
The Rules
Overview
Accumulate points by finding the “Are You Hound Enough? V2.0" geocaches. Most points wins.
What Do You Need to Do?
When you log an “Are You Hound Enough? V2.0” geocache online, record the line number on which you signed the log. If you do not list the line number, you will not be awarded points. (You can do this with a picture of the log if you want.)
Points
Position: Position points are given by the line number on which you sign the log. 20 points for the first line, 19 points for the second line, …, down to 1 point for the twentieth line.
Bonus: The first three finders receive bonus points based on the sum of the terrain and difficulty ratings of the geocache. The First to Find receives two times the sum of the terrain and difficulty ratings, Second to Find receives the sum of the terrain and difficulty ratings, and Third to Find receives one half the sum of the terrain and difficulty ratings. These points are in addition to the Position Points.
Example: If you are First to Find on a 2.5/3 geocache, you receive 20 position points and 11 bonus points for a total of 33 points.
More Rules
Points are awarded to caching names, not individuals. Points will be awarded to only one caching name per line, so make sure you don’t sign the log on the same line as another cacher. If two cachers sign on the same line, points will only be awarded to the cacher that logs the geocache online first. Any disputes not explicitly covered in these rules will be settled by us and all decisions will be final.
The Geocaches
The geocaches are traditionals, multis, and mysteries. They are a variety of terrains and difficulties. They are placed at a variety of directions and distances from our home at approximately I-44 and Grand Avenue with a maximum distance of 50 miles. (So they will be submitted for publication on a variety of days and at a variety of times. The actual publication days and times will depend on the reviewers. We will submit one “Are You Hound Enough? V2.0" geocache per week for 20 weeks starting the week of April 24 - April 30.
End of Series Event
There will be an event sometime in the fall to award prizes.