Thematic Strategy

I have a range of books I am working on in different stages. One thing I particularly am looking for are small groups of thematically related books. The idea being, similar books help sell each other, and of course a customer who likes one book may be more willing to buy another from the same publisher.

I haven't done much with Lancaster County material, though I've been back in the area for about seven years. I should have a few books coming out by a local author/speaker that are of some regional interest (and he'll be selling direct, which will be the bulk of sales). He has a few local natural history subjects, another on the county's covered bridges, and I'm trying to talk him (and his wife) into an authentic Pennsylvania Dutch cookbook.

I'm a bit behind in my personal cryptozoology titles, but I need to bolster my monthly sales first before spending all that time putting together titles with a limited market.