Geology of Wisconsin: Survey of 1873-1879, Volume IV
In the preface of the preceding volumes, sufficient explanation has been made of most matters requiring consideration in such connection. For reasons explained in the preface of Vol. III, and for others that have arisen since, the earlier portions of this volume have rested in type, awaiting the completion of the remainder, for a length of time much to be regretted. Consideration of this fact is due to the authors of Parts I, II and III. The atlas accompanying this volume includes, besides those relating to its subject matter, the general maps that more properly belong with Vol. I, with which no atlas will be issued. They are here included for economy and convenience of distribution. The maps accompanying Vols. II, III and IV are intended to be combined to form a single atlas. If bound in folio, as planned, it will be reduced to a convenient size.