Titles marked free include one copy at no charge but include mailing charges. Additional copies are available at a nominal fee that varies by publication. Other titles may be purchased for the price indicated at the end of the entry. This order number should be included in any order or related correspondence. Cross references within this catalog are listed by order number.
Authorship is listed on each title prepared by one or a few division staff members.
For division publications, if no author is listed, many members of the staff contributed. Missing numbers indicate titles that are out of print. Copies of these may be studied or copied at the division. For a list of all division publications, including those out of print, contact the division. In addition, open-file reports such as contract reports and unpublished field guides or talks, are also available for study or copying at the division.