These wonderful postcard image Views of Newcastle from the mid-1870s are available in both jpg and tif format from the State Library of Victoria site here: http://search.slv.vic.gov.au/primo_library/libweb/action/dlDisplay.do?vid=MAIN&docId=SLV_VOYAGER2517591&fn=permalink
Click on the images to see the higher resolution jpgs generated from the original tif images. Dr Ann Hardy has located very similar postcard images in the Holtermann collection at the State Library of NSW. They have unfortunately not been digitised yet. You can read her posts concerning this collection through the Hunter Regional Branch of the National Trust site: http://nationaltrust-hunternewcastleregion.blogspot.com.au/2014/01/the-holtermann-collection-featured-in.html and on the Radio ABC1233 Newcastle site here: http://www.abc.net.au/local/photos/2014/01/28/3933315.htm