[1] The couple established Geographia, Ltd, a commercial map publisher, first in an office on John Street, off The Strand.

As his son puts it, he emerged as one of the few people in England who could not only map Mitteleuropa but actually knew something about the various nations that comprised it and could speak several of its languages.

"[8] In the war's immediate aftermath, the company produced "The Daily Telegraph Victory Atlas of the World" in forty-eight weekly installments.

[6] Gross provided a full-color 1,200 square inches (0.77 m2) map for the 1917 edition of the South American Year Book.

[3]Having lost everything, the cartographer moved to the United States, met a woman in the main reading room of the New York Public Library in 1923 and followed her to Chicago when she returned to Illinois, where he first taught English.

[1][3] She would give him a son in 1931 to whom he gave his own name,[3] after Gross had briefly returned to London at the end of the 1920s when the liquidation of Geographia Ltd was finally coming to a close.

[3] The Hudson News Company was a major sales outlet as it distributed publications to the city's countless newsstands and candy stores.

Based at 231 Hackensack Plank Road in Weehawken, New Jersey,[14] it was purchased by the Rand McNally Corporation, and then re-purchased by its original owners several years later.

[15] The company's maps are based on information gleaned from various government sources, including official surveys and aerial photographs, but it also relied on tips from average citizens.

[12] Dozens of other locations were covered,[2] including Buffalo, Cincinnati, Pittsburgh, Rochester,[14] Atlanta, Atlantic City, Binghamton, Birmingham (AL), Charleston (SC), Cleveland, Gary, Grand Rapids, Honolulu, Kansas City, Los Angeles, Louisville, Miami, Montreal, Milwaukee, Minneapolis/St.