523-02110
Water Quality Testing Still Life
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523-02110
Water Quality Testing Still Life
523-02112
Water Quality Testing Still Life
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523-02112
Water Quality Testing Still Life
523-02113
Water Quality Testing Still Life
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523-02113
Water Quality Testing Still Life
523-02119
Water Quality Testing Still Life
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523-02119
Water Quality Testing Still Life
523-02120
Water Quality Testing Still Life
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523-02120
Water Quality Testing Still Life
523-02124
Tech pouring water into test tube.
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523-02124
Tech pouring water into test tube
523-02127
Tech pouring water into test tube.
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523-02127
Tech pouring water into test tube
523-02128
Tech pouring water into test tube.
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523-02128
Tech pouring water into test tube
523-02129
Tech pouring water into test tube.
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523-02129
Tech pouring water into test tube
523-02131
Tech pouring water into test tube.
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523-02131
Tech pouring water into test tube
523-02132
Tech pouring water into test tube.
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523-02132
Tech pouring water into test tube
523-02133
Tech pouring water into test tube.
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523-02133
Tech pouring water into test tube
523-02072
Refraction and Inversion
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523-02072
Refraction and Inversion
524-00397
Water Quality Test
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524-00397
Water Quality Test
524-00398
Water Quality Testing for Pollutants
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524-00398
Water Quality Testing for Pollutants
524-00399
Researcher Tests Water for Quality and Contaminants
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524-00399
Researcher Tests Water for Quality and Contaminants
801-04988
Body fat measurement
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801-04988
Body fat measurement
800-08266
DISTILLED WATER TAP WATER and SEA WATER  MENISCI
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800-08266
DISTILLED WATER TAP WATER and SEA WATER MENISCI
353-07061
Photosynthesis Absorption Of Co2 By Elodea Oxygen
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353-07061
Photosynthesis Absorption Of Co2 By Elodea Oxygen
353-05438
CLEAN MEDICAL LAB ROOM CHEMICAL LAB CIRCA 1940S
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353-05438
CLEAN MEDICAL LAB ROOM CHEMICAL LAB CIRCA 1940S
353-04211
Checking water PH in fish Tank with PH test paper
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353-04211
Checking water PH in fish Tank with PH test paper
353-04212
Checking water PH in fish Tank with electric meter
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353-04212
Checking water PH in fish Tank with electric meter
291-01079
WATER PRESSURE TEST FIRE DEPT.
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291-01079
WATER PRESSURE TEST FIRE DEPT