book by Maryland Geological Survey published in 1900

1929 publication by Maryland Geological Survey

Baltimore,The Johns Hopkins Press,1907

volume 7 of the book series Maryland geological survey

1902 book by Maryland Geological Survey

volume 5 (part 3 of 3) of the 11-part book series Maryland Geological Survey

1926 book, published by The Johns Hopkins press

book series by Maryland Geological Survey; published as 8 volumes in 11 parts, 1901–1923

volume 2 (in two parts: texts and plates) of the 11-part book series Maryland geological survey

book by Maryland Geological Survey published in 1911

Baltimore, The Johns Hopkins press, 1926.

journal

book series by Maryland Geological Survey

Baltimore,The Johns Hopkins Press,1907.

volume 6 (in two parts) of the book series Maryland geological survey