by Helen Ross Russell; illustrated with photographys and with line drawings by Gene Garone Leo Schneider; illustrated with photographs and with drawings by Gustav Schrotter D.S.Halacy; illustrated with photographs and line drawings by William J. Cromie; illustrated with photographs and with diagrams and maps by Arthur Knapp by Harvey Weiss; illustrated with photographs, plans and drawings by Frank Ross; illustrated with photographs and diagrams Elizabeth A. Wood ; illustrated with photos. and with drawings by Frank M. Thayer.