Surveyors surveying tower across river

39th(?) of 38 engravings of artillery weapons, etc., from Fronsperger; diagram with 2 surveyors at right, surveying tower across river at left. 39th(?) of 38 engravings of artillery weapons, etc., from Fronsperger; diagram with 2 surveyors at right, surveying tower across river at left. Folio; most engravings yellowed or trimmed close. Leichtenstein-Hauslab Collection, 1951. title provided by cataloger
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