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geologen

Robert Dick

By Samuel Smiles

Sir William Dawson, a life in science and religion

By Charles F. O'Brien

Stepping-stones

By Katharine Fowler-Billings

Memoirs of William Smith

By Phillips, John

Grove Karl Gilbert, a great engine of research

By Stephen J. Pyne

Gustaaf Molengraaff, 1860-1942

By Frederik R. van Veen

Adventurous alliance

By Louise Hall Tharp