I recently picked up an old Marsh Aviation postcard. It pictures an “N” and the phrase “If it’s a silver airplane with a yellow nose it’s Marsh Aviation”. It was printed on a linen-like surface by Western Lithograph in Los Angeles.
This is a high-resolution scan – you can click on the photo to enlarge.
On the reverse side it says “There is no substitute for experience. If it has been done on the farm by an airplane, Marsh has done it. Crop Dusting, Liquid Spray, Seeding, Defoliating, Selective Weed Control and Fertilizing.”
I will be adding this to the Ag Aircraft page as well.