Engins invented to save much blood and moneyes (in these times of warre) and to doe extraordinary good service, with the approbation of the Honourable Major Generall Skippon, and five of the committee for the fortifications of the city of London.

Edmond Felton London : Printed for Thomas Vnderhill at the signe of the Bible in Wood-street, M.DC.XLIV. 1644

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