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A concave mirror
ARP23A15_214

A concave mirror

A concave mirror
ARP23A15_195

A concave mirror

A concave mirror
ARP23A15_212

A concave mirror

A concave mirror
ARP23A15_198

A concave mirror

A concave mirror
ARP23A15_218

A concave mirror

A concave mirror
ARP23A15_217

A concave mirror

A concave mirror
ARP23A15_196

A concave mirror

A concave mirror
ARP23A15_197

A concave mirror

Sinking a mineshaft by Triger's method, 1841
ARP07112_009761P

Sinking a mineshaft by Triger's method, 1841