Catalogue of invertebrate fossil types at the Academy of Natural Sciences of Philadelphia /

بواسطة Richards, Horace G. (Horace Gardiner), 1906-
منشور في 1968

Annotated bibliography of quaternary shorelines : supplement 1965-1969 /

بواسطة Richards, Horace G. (Horace Gardiner), 1906-
منشور في 1970

Annotated bibliography of quaternary shorelines : (1945-1964) /

بواسطة Richards, Horace G. (Horace Gardiner), 1906-
منشور في 1965