NC State University Libraries' Rare and Unique Digital Collections

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Please note that some historical materials may contain harmful content and/or descriptions. Learn how we're addressing it.

Belmont Murphy explaining the water management system on his Edgecombe County Farm

Belmont Murphy explaining the water management system on his Edgecombe County Farm
1986

Charles E. Bishop examining chart

Charles E. Bishop examining chart

Charts used in heating application classes

Charts used in heating application classes
1958

Charts used in heating application classes

Charts used in heating application classes
1958

Charts used in heating application classes

Charts used in heating application classes
1958

Charts used in heating application classes

Charts used in heating application classes
1958

Charts used in heating application classes

Charts used in heating application classes
1958

Charts used in heating application classes

Charts used in heating application classes
1958

Charts used in heating application classes

Charts used in heating application classes
1958

Charts used in heating application classes

Charts used in heating application classes
1958

Charts used in heating application classes

Charts used in heating application classes
1958

Charts used in heating application classes

Charts used in heating application classes
1958

Charts used in heating application classes

Charts used in heating application classes
1958

Charts used in heating application classes

Charts used in heating application classes
1958

Charts used in heating application classes

Charts used in heating application classes
1958

Charts used in heating application classes

Charts used in heating application classes
1958

Charts used in heating application classes

Charts used in heating application classes
1958

Charts used in heating application classes

Charts used in heating application classes
1958

Charts used in heating application classes

Charts used in heating application classes
1958

Charts used in heating application classes

Charts used in heating application classes
1958

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