Public domain
AIR MAIL. INAUGURATION OF SERVICE, POLO FIELD. START OF 1ST CONTINUOUSLY SCHEDULED SERVICE. CURTISS JN-46-H PLANE. PRESIDENT AND MRS. WILSON
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Credit lineAIR MAIL. INAUGURATION OF SERVICE, POLO FIELD. START OF 1ST CONTINUOUSLY SCHEDULED SERVICE. CURTISS JN-46-H PLANE. PRESIDENT AND MRS. WILSON. 1918-01-01. Harris & Ewing. Harris & Ewing Collection, Library of Congress. Public domain.