Bill Cullina has published two books you might find useful:
"The New England Wild Flower Society Guide to Growing and Propagating Wildflowers of the United States and Canada"
https://www.amazon.com/dp/0395966094/
"Native Trees, Shrubs, and Vines: A Guide to Using, Growing, and Propagating North American Woody Plants"
https://www.amazon.com/dp/0618098585/
The books focus on plants that are native to the temperate regions of North America, but both contain detailed information on propagating 1000's of species, including how to harvest, store, and germinate seed.
It's not a book, but the catalog that Prairie Moon Nursery puts out each year includes vast amounts of information on germinating seeds of the 1000's species of plants they sell. Their website also includes pictures of the seeds for most of species they sell. As you might expect, most of the plants they sell are native to the upper Midwest, but still, they are a treasure trove of information.
https://www.amazon.com/dp/0618098585/
