Mail contracts. Bulletin advertisement inviting proposals for service of carrying mails in screen wagons and for service of furnishing equipments for carrying mails at Boston, Mass., July 1, 1915 (or such subsequent date as Department may order)—June 30, 1917, and at San Francisco, Cal., July 1, 1915 (or such subsequent date as Department may order)—June 30, 1918.

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