Note 42 — Chapter VII · EL MORRO, THE AUTOGRAPH ROCK OF THE CONQUISTADORES
Reading edition
Reports of the Secretary of War, Senate Ex. Doc. 64, First Session 31st Congress, 1850. A more illuminating account of the Rock is given by Mr. Chas. F. Lummis in “Some Strange Corners of Our Country.” An able supplement to this is a paper by H. L. Broomall and H. E. Hoopes in Proceedings of Delaware County Institute of Science, Vol. I, No. 1, Media, Pa.