Especially military history. My military history books are organized chronologically by war, starting with the French and Indian, going through GWOT.

WWII has just been a single block, but I've acquired a lot more books for that war, and I'm wondering if I should split it up by theater. And if I do, is it vs Germany and vs Japan, or US/UK vs Germany, Eastern Front, Asia-Pacific?

Other categories include world history, US history, military theory, and poli-sci. And fiction.

Civil War books together alphabetically by author

Everything else together alphabetically by author

Also segregated by read and unread.

I have 3 stacks

- Books I'm currently reading
- Books I haven't read yet
- Books I've already read

Chronological order

But I'm running out of bookshelf space

Two shelves just for WWII. One devoted to the Pacific, the other devoted to Europe/North Africa/the North Atlantic.

Another shelf for French & Indian War, American Revolution, US Civil War, WWI, Vietnam, GWOT. I don't believe I have any books on Korea.

Books I want to keep or might reread.

Everything else goes to the local book store for credit.

I used to have about 250 books in the house scattered in multiple places. We did a home remodel a few years back and my wife suggested building a book nook where the wet bar is which we never used. I put my favorites plus one other spot in the living room with one of those stacked tower bookshelf. I sold a lot at Half Price Books and kept the rest. I now have just under 100 as my wife and I are trying to live a semi-minimalist lifestyle.

By time period/war.

My Dad's library? Two rooms with entire walls of full book cases. It will be interesting when he passes.

When we moved from Texas to Colorado a couple of years ago, I donated a lot of my books to friends or to the local library. Those that survived the cut are generally sorted by size (depending on what shelf they fit), then by period/war (except for those that haven't been organized at all, and those are randomly on shelves more or less by whose books they are (mine or my wife's). Maybe someday they will get better organized, but then again, maybe not.