CPH to Crocker, Jan. 12, Feb. 4, 1882, CPH Papers, vol. 29, ser. 2, r. 6.

CPH to Gates, Oct. 16, 1889, CPH Papers, ser. 1, r. 48.

Black, "American Labour and Chinese Immigration," 63.

C. Crocker to CPH, Jan. 21, 1882, no. 507, Jan. 27, 1882, no. 517, Crocker Papers, box 1, f. 12.