@book{150, author = {Umbgrove, Johannes Herman Frederik, and Houten, J. L. van, [from old catalog]}, title = {The pulse of the earth /}, publisher = {M. Nijhoff,}, year = {1947.}, address = {The Hague,}, edition = {2nd ed.}, note = {"With 8 partly coloured plates, 204 textfigures and 12 tables."} }