Reference books for the historian of science
Printed book - Jayawardene S. A., 1982
La théorie des parallèles
Printed book - Lobatchevski Nikolai͏̈ Ivanovitch, impr. 1980
Teaching children mathematics
Printed magazine - National Council of Teachers of Mathematics
Humboldt and the cosmos
Printed book - Botting Douglas, 1973
Alte Sonnenuhren an europäischen Gebäuden
Printed book - Zinner Ernst, 1964
Terres africaines .
Printed magazine