My blog, folkdancemusings.blogspot.com has a huge list of dance instructions, including instructions for all the dances on this website. You'll also find information on where to get the music for these dances.
The Folk Dance Federation of California has two websites with links to many dance notations. socalfolkdance.com and folkdance.com
The Stockton Folk Dance Camp has over 70 years worth of syllabi from dance camps: folkdancecamp.com
Bob Shapiro's website has many dance instructions: folkdancenotes.com