A picture version of sudoku?

Very intriguing.
I've tried to enhance the photos to try to read the pencil text, but can't make it out.
The symbols and shading look non-random, so I don't think it's doodling. From what you say, there are a number of these fixed (glued?) to a sheet. That suggests it's something that's meant to be viewed as a whole (as we might draw up a family tree on separate sheets of A4, but to get the overall picture you have to fit all the sheets of paper together).
It doesn't look to me like a garden/planting plan - there's no flow or layout to the "design" (if it is a design).
For those who've suggested that it's something to do with needlework - are you guessing, or does it actually look like a needlework pattern - i.e. could a cross-stitcher/quilter/embroiderer or whatever today actually translate it into something?
Not sure it helps at all, but is the grid pre-printed on the paper? If it's on pre-printed paper, then it follows that someone is making the paper like that for a reason. Was graph paper made like that back then? Actually, if it's pre-printed graph paper, the squares would presumably be drawn out into fractions of inches: I don't know what the size of these sheets are, but it doesn't look like they're inches divided up. These are 3x3 grids, which then combine into a 5x5 grid and then into a 2x2 grid.
I can't think of anything that standardly divides up into fifteenths.
If it were a game of some sorts (an early version of battleships as already suggested), there might be more correlation between different grids? A B1, D7 grid referencing system printed on the paper would make that more likely. But why would they have been kept and all put together on one sheet?
The fact that they went to the trouble of preserving them, suggests they must have had some significance. Maybe where it was found, and what was kept with it might help?
If you want a completely random guess that I don't think anyone else has suggested yet, how about some form of coded message? That might explain why there is some pencil writing too - someone working out the code? But that's just a guess, and really I'm just completely perplexed!