If you're in the park, I suggest you purchase this. It only costs a
few dollars, and will provide hours of fun reading and tons of valuable
information.
"Selected Caves and Lava-tube Systems in and near Lava Beds National
Monument, California (USGS survey bulletin 1673)" is probably the best
source of cave information that I have seen. The volume comes with a
100 page booklet that describes many caves and cave formations in great
detail (including many of those that aren't open to the public.)
Additionally, excellent maps of tons caves are included.
This book can be ordered directly from USGS by sending $16.00 + $3.50 S/H to:
To verify that this is the correct address and current pricing, I suggest you call 1-800-USA-MAPS or 1-800-HELP-MAP for more assistance.
(Many thanks to Mark Gerolimatos for pointing me to this book!)