The Young Wireless Operator—With the U. S. Secret Service

The Secret Wireless / or, The Spy Hunt of the Camp Brady Patrol

The Young Wireless Operator—As a Fire Patrol / The Story of a Young Wireless Amateur Who Made Good as a Fire Patrol

The Flying Reporter

The Young Wireless Operator—Afloat How Roy Mercer Won His Spurs in the Merchant Marine

The Wireless Operator—With the U. S. Coast Guard