Front: Municipal Airport, Portland, Maine 24 AST %3D 面用田F 76929 Uㄇ Back: "TICHNOR QUALITY VIEWS" REG. U. S. PAT. OFF. MADE ONLY BY TICHNOR BROS., INC., BOSTON, MASS. PUB. BY LORING, SHORT & HARMON, PORTLAND, MAINE,
