The paper is of advisory character and is intended for biologists engaged in teaching. Directions are given for the search, in their natural habitats, for suitable specimens of invertebrate animals, their culture in ...

The article contains a comprehensive study of goods railway transport in Rzeszów voivodship. For a comparative review are taken the years 1930 and 1960. Regional transport is considered separately and in correlation ...

The main factor inciting to activity the north part of Rzeszów voivodshaft is industry. The further development of local industry ought to follow the line of exploitation of its natural riches. The local natural resources ...

The article is brief review of recent opinions concerning the problem of overpopulation, presented on the background of the development of the existing world wide demographic situations the natural population ...

A general reviev of world-wide sulfur supply and demand gives an account of a steadily groing production of sulfur namely, from 8620,7 th. tons in 1938 /China and U.S.S.R. excluded/ and 11244,0 th. t. in 1950 /China and ...

In the first part of the article the author gives a brief review of the most distinctive features of the French Pyrenees geographic environment. He mentions such characteristics as the size and the number of post-glacial lakes; ...

Actual demographic problems in Sudan are consideres on the ground of data furnished by the first Sudanese census in 1956, Sudanese problems are an instance of conditions prevailing in African weakly developed countries. ...

The author discusses in popular form the lines of production and agricultural structure in Ethiopia on the ground of material collected by him in the course of his two months visit in that country.