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America's Giant Gun to Space: The HARP Experiment

In the 1960s, America explored space with rockets—but Project HARP tried a different approach: using a massive gun. This High Altitude Research Project aimed to reach orbit more cheaply. Designed by ...
insider.si.edu

Paris Kanonen--the Paris guns (Wilhelmgeschütze) and Project HARP : the application of major calibre guns to atmospheric and space research / G.V. Bull, C.H. Murphy

The development of Krupp's long range guns during the World War / Fritz Rausenberger -- Behind the Big Berthas / Max Bauer -- The bombardment of Paris during the Great War / Ferdinand von ...