Tunnel map

Chicago citation style
Barton, Carol June (Creator) et al. Tunnel map. 1988. Retrieved from the Digital Public Library of America, https://digital.library.wisc.edu/1711.dl/VHHP6OBZPXWKB8C#BIB0. (Accessed December 11, 2019.)
APA citation style
Barton, Carol June (Creator) et al, (1988) Tunnel map. Retrieved from the Digital Public Library of America, https://digital.library.wisc.edu/1711.dl/VHHP6OBZPXWKB8C#BIB0
MLA citation style
Barton, Carol June (Creator) et al. Retrieved from the Digital Public Library of America <https://digital.library.wisc.edu/1711.dl/VHHP6OBZPXWKB8C#BIB0>.
Note: These citations are programmatically generated and may be incomplete.