Hi guys,
Hartung's classic book is definitely hard to get, listed by libraries and astronomical societies - but finding a copy - good luck. I have the original edition and also Malin and Frew's excellent revision. This was on a newsagency's chuck-out table for $10!!!!
I don't know if these sites are a help or not. They list the title. You can only try:
http://www.boomerangbooks.com.au/Har...0521554916.htm
http://www.shearersbookshop.com.au/b...ine%20Roucoux=
http://www.panmacmillan.com.au/displ...0Frew,%20David