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subject grows increasingly difficult with the ever-growing array of 
articles that appear. 
There are two major attempts to catalog the zoological articles of 
the world—The Zoological Record in England and Biological Abstracts 
in this country. 
The Zoological Record, now in its 69th year, lists the articles by 
authors, giving title and reference. For 1932 there are 1385 entries 
under Aves. Next there is a subject. index where the articles are 
arranged under all sorts of topics—migration, nidification, courtship, 
physiology, geography, etc., etc. Finally there is the systematic index 
with the articles arranged under each species. It will be seen that the 
Zoological Record is a reference source of great importance. It should 
be available in every large library, while the section on Aves may be 
purchased separately for 7 shillings 6 pence. 
Biological Abstracts is a much more recent enterprise, having just 
completed its eighth year. As its name denotes, a brief account of the 
contents of each article is given. The papers under Aves are arranged 
under the following topics: General or Popular; Systematic; Life 
History; and Local or Faunistic; while references are also given to 
other bird papers abstracted under Ecology and other subjects. There 
is much valuable material in Biological Abstracts, but due to lack of 
funds it is not up to date, articles of 1930 and 1931 being in the ma- 
jority at the end of 1933. It should be found in all college and large 
general libraries. 
Those bird students who read German will find good reviews in 
Vogelzug, a quarterly journal with an excellent index at the end of 
each year, covering both original and reviewed material in the fields of 
banding, migration and life history. 
The problem, of course, after one has found a reference, is to get 
hold of the article. If the journal is not in the library, it may be that 
the library will borrow it for the investigator. Or perhaps a reprint 
may be obtained from the author. 
It has been planned in Bird-Banding to review the literature with 
the purpose of giving the greatest possible help to banders—to suggest 
problems and to give some definite facts that have been found by others. 
The usefulness of this department will depend on the support given to 
Bird-Banding; the larger the subscription list, the more space can be 
allotted to reviews. 
Cooperative Study 
Although good work can be done individually in life history studies, 
there are many general problems in bird biology that can be far bet- 
ter handled codperatively. 
Stevens (’32) after suggesting a number of subjects for research 
connected with “The problem of the return of the young birds’, hopes 
“that such material can be brought together from many sources and 
combined into a few comprehensive reports rather than be published 
in a large number of short notes by individual workers. Codperative 
