@book
{TN_libero_mab2,
author = {
Ulmer, Joseph
},
title = {
International trade in mica
},
publisher = {U.S. Govt. Print. Off},
year = {1930},
booktitle = {Trade promotion series ; 95},
address = {
Washington
},
url = {
http://slubdd.de/katalog?TN_libero_mab2
}
}