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Colvin'S hydraulic milking machine: corrugated rubber suction cups were placed over the teats
ARP23A14_081

Colvin'S hydraulic milking machine: corrugated rub...

Robert Louis Balfour Stevenson
ARP07113_010483P

Robert Louis Balfour Stevenson

Robert Louis Balfour Stevenson
ARP07113_010484P

Robert Louis Balfour Stevenson

Robert Louis Balfour Stevenson
ARP07113_010485P

Robert Louis Balfour Stevenson