A ramp plate placing machine is shown in the National Gypsum Company shipping room. The National Quarry (Tawas Quarry, Tawas Mine?) is an open pit gypsum mine near National City, Michigan operated by the National Gypsum Company. The mine was an important gypsum producer in Michigan for decades. The National Gypsum Company began working the gypsum deposit here in 1925 and the existing town was renamed National City.
Rights management statement available at: http://library.mines.edu/digital/rights.html
The export option will allow you to export the current search results of the entered query to a file. Different
formats are available for download. To export the items, click on the button corresponding with the preferred download format.
By default, clicking on the export buttons will result in a download of the allowed maximum amount of items.
To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export.
The amount of items that can be exported at once is similarly restricted as the full export.
After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.