Preventive maintenance for bridges / Diane Purdy.

Chicago citation style
Purdy, Diane, author. Preventive maintenance for bridges / Diane Purdy.. Retrieved from the Digital Public Library of America, https://archive.org/details/preventivemainte00purd. (Accessed December 15, 2018.)
APA citation style
Purdy, Diane, author, Preventive maintenance for bridges / Diane Purdy.. Retrieved from the Digital Public Library of America, https://archive.org/details/preventivemainte00purd
MLA citation style
Purdy, Diane, author. Retrieved from the Digital Public Library of America <https://archive.org/details/preventivemainte00purd>.
Note: These citations are programmatically generated and may be incomplete.