Colby, C. B

A parade of photographs and brief details of the weapons of today's servicemen.

Describes and illustrates various signs, such as tracks or homes, by which an observer can tell what animals are in an area.

Describes and illustrates various signs, such as tracks or homes, by which an observer can tell what animals are in an area.

Pictures and textg trace the development of American combat planes.

A parade of photographs and brief details of the weapons of today's servicemen.

Describes the different types of sailing ships, their masts, sails, and riggings.

Contains photographs of about 15 famous early fortifications of various types, ranging from the crudest stockade to the massive stone fortresses along our coasts.