Candid,

My best guess:

Yes, there probably are some records. Especially of the clans in the east and west. But, they are probably all in Japanese. Seal, might know how to get a hold of them (of may know of them off hand), but I do not. Your best hopes probably lie in trying to find some Hojo clan domestic report or Imagawa perhaps in the east. In the west, I am not sure how much attention was paid to this stuff. Also, the Shingen did a lot to make shinano more agriculturally successful.

Sorry I can't be of more help.

-Zen Blade

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Zen Blade Asai
Red Devil
Last of the RSG
Clan Tenki Council-Unity