FRANK A. PERRET (1867-1943) WAS A PROMINENT AMERICAN ENGINEER, INVENTOR, AND VOLCANOLOGIST FAMED FOR HIS WORK MONITORING MOUNT PELEE IN SAINT-PIERRE, FRENCH WEST INDIES, SET INCLUDES 23 POST CARDS, EACH WITH BRIEF DESCRIPTION OF THE SUBJECT, ALL CARDS ARE CLEAR FROM ANY WRITING
5 1/2" X 3 1/2"