In celebration of the 75th year of publication, the Geophysics editorial team invited a collection of papers written by well-recognized experts in various areas of exploration geophysics. These invited papers not only form part of the present book, but they also appear in the September-October 2010 special section of the journal. Geophysics Today: A Survey of the Field as the Journal Celebrates its 75th Anniversary complements this special section with an additional group of papers, drawn from Geophysics, to address areas beyond the invited articles. The result is a snapshot of the state-of-the-art in the field as Geophysics passes its three-quarter-century mark. This book is Geophysical References Series No. 16.