Bluebird Resources

The Bluebird Book and The Birdhouse Book
by Donald and Lillian Stokes

Bluebird Activity Book [FREE PDF]
by Myrna Pearman

Enjoying Bluebirds More
by Julie Zickefoose

San Diego County Bird Atlas
by Philip Unitt

California Bluebird Recovery Program (CBRP)
collects nestbox data on cavity-nesting birds