Hobbs , R. C., D. J. Rugh, J. M. Waite, J. M. Breiwick, and D. P. DeMaster. “Abundance of Eastern North Pacific Gray Whales on the 1995/96 Southbound Migration”. J. Cetacean Res. Manage., vol. 6, no. 2, Mar. 2023, pp. 115-20, doi:10.47536/jcrm.v6i2.774.