Some of you may be familiar with this excellent hobby publication from Germany that began in 1996. There is a set of books on various fish groups, for example one called All Corydoras
that contains multiple photos of all species of Aspidoras, Corydoras and Brochis that were known at the time of publication. Updates (in the form of photo stickers that could be stuck in on the spare pages included in the volumes) appeared in a small publication named AqualogNews
that came out in both German and English for the first 12 editions and subsequently in both languages separately. Each issue contained reports on new discoveries, information on various fish species, etc.
Some fish stores carried these, but usually private subscription was the only means of acquiring AqualogNews--until now. All issues are now available online and for free.
Here is the link: http://aqualog.de/news/news_pdfen/info_down.htm
The issues can be read online or downloaded and printed. These publications contain good, well-documented and researched information, and I recommend them.