COMMONWEALTH PATENTS.

Barrier Miner (Broken Hill, NSW : 1888 - 1954), 20 January 1910, page 3

http://nla.gov.au/nla.news-article45097222

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Wragge's Observatory - plans and hatchway

http://khuts.org/index.php?option=com_content&view=article&id=1037:wragge-s-observatory-plans-and-hatchway&catid=89&Itemid=204