Greg Burns currently serves as editor of The California Numismatist, the award-winning joint publication of the California State Numismatic Association (CSNA) and the Numismatic Association of Southern California (NASC), and has been a coin collector for about 35 years. His collecting passions are the satirical medals of the German medallist, Karl Goetz, medals relating to WWI in general, and he has a longtime fascination with Canadian colonials and bank tokens.
www.karlgoetz.com Scott Goodman's comprehensive site on all things Goetz.
www.money.org The ANA library is a great place to conduct research.
www.harrybassfoundation.org The HBF has a numismatic periodical search engine.
www.iwm.org.uk The Imperial War Museum has some material specifically on the Lusitania and the medal.
www.rcna.ca Randy Nelson wrote a piece for the journal of the Royal Canadian Numismatic Association.