NONFICTION BOOKS: Submit a strong proposal and at least two sample chapters. For information about how to put together a "killer" proposal, see Writing Nonfiction Book Proposals.
Don't forget to include a self-addressed, stamped envelope (SASE). Mail your submission to James R. Cypher, The Cypher Agency, 816 Wolcott Avenue, Beacon, NY 12508-4261.
Although I don't mind receiving brief E-mail queries, I much prefer to focus on printed pages you have sent me via snail mail rather than scrutinizing huge chunks of text on my monitor.