A postscript to my first message in this thread to report a "discovery within a discovery". I refer to the second source I chanced upon:
History | Underwater Skindivers and Fisherman's Association. I have since delved further within this website, which resulted in the discovery of a huge archive of scanned issues of the
Australian Skindivers Magazine dating from 1958. The period ads in these journals have helped me quite a bit in my efforts so far to reconstruct the timeline for a history of the Australian diving equipment manufacturer and distributor M. D. Turnbull Pty Ltd based in Sydney, New South Wales. I'll post more here about the latter when I've organised my existing printed source materials about the Turnbull company. Have any of our Antipodean friends anything to share with us to complement what I've found so far? Anything welcome, particularly personal anecdotes and reminiscences.
In the meantime, I'm going to reproduce below all the online sources of free PDF downloads of early diving magazine issues I know about, including the Australian Skindivers Magazine I mentioned above. Hope they are of use and interest to others.
1. Australian Skindivers Magazine
For a bit of context, read first "A brief look at Australian Skin and Scuba diving periodicals" at
Magazine | Underwater Skindivers and Fisherman's Association. Then follow the link at the bottom of the page to
https://drive.google.com/open?id=0B_GphfzMEbApS1YtZjBXcnUtSUU. At that location, you will find over 50 editions of the magazine beginning with numbers from the 1950s.
2. The Historical Diving Societies of America, Italy and Sweden
(a) Historical Diver/The Journal of Diving History, USA (1993-2015):
Browse by Issuing Agency - Aquatic Commons.
(b) HDS Notizie, Italy (1995-2017):
HDS NOTIZIE | The Historical Diving Society Italia.
(c) Signallinan, Sweden (2009-2017):
Signallinan – SDHF.
3. Skin Diver
The first, December 1951, issue of Skin Diver magazine can be downloaded from here:
http://tinyurl.com/oo24y2c. I have posted a scan of my own print copy of the November 1956 "Exposure Suits" edition of Skin Diver magazine at
https://tinyurl.com/y75c9lzb. Any others?
4. The London Diver
The London Diver magazine, Volumes 1-2 (May/June 1959 - Sept/Oct 1960). 8 issues. Location:
http://tinyurl.com/nasf9xg.
5. Royal Navy Diving Magazine
Royal Navy Diving Magazine, Volumes 1-16 (July/Sept 1951-December 1970). Volume 1 Number 1 is
5 months older than the first issue of "Skin Diver"! Location:
RN Diving Magazines.
6. Revue Française de Plongée
Seven issues (2001-2010) of French-language Revue Française de Plongée diving research magazine produced by France's national university diving group
Groupement National de Plongée Universitaire (GNPU). Location:
Revue Française de Plongée (RFP).
7. TauchHistorie
Seven full-text issues of the German-language diving history magazine TauchHistorie from 2013 to 2016 can be downloaded in PDF format from:
Zeitschrift TauchHistorie.
8. Спортсмен-Подводник
A complete run of the former USSR's Russian-language skin and scuba diving magazine Спортсмен-Подводник (transliterated as "Sportsmen-Podvodnik" and translated as "Underwater Sportsman") has been posted online for free download. Scans of every issue of the journal between 1962 and 1991, documenting Soviet diving across the sixties, seventies and eighties are available from:
Спортсмен-подводник. Журнал о подводном плавании. ВСЕ сборники СПОРТСМЕН-ПОДВОДНИКа ..
Do you know any other online sources of past issues of historical diving magazines? Please share!