http://archiver.rootsweb.ancestry.com/th/read/GER-RUS-ARG/2009-02/1235588943
http://archiver.rootsweb.ancestry.com/th/read/GER-RUS-ARG/2009-02/1235515735
http://www.apellidositalianos.com.ar/volga/censo_volga_concesiones.htm
http://records.ancestry.com/Johannes_Schroh_Edenkoben_Germany_records.ashx?pid=177974379&gss=seo
http://books.google.com.ar/books?id=XO_gAAAAMAAJ&q=schroh+1758&dq=schroh+1758&hl=es&ei=pEmGTOHnBYP6lwf4mKzqCQ&sa=X
http://books.google.com.ar/books?id=ZASS0CoEHjIC&pg=PR323&dq=schroh+1758&hl=es&ei=pEmGTOHnBYP6lwf4mKzqCQ&sa=X&oi=book_result&ct=result&resnum=2&ved=0CCcQ6AEwAQ#v=onepage&q=schroh%201758&f=false
colocar schroh 1758, 1688.
freepages.genealogy.rootsweb.ancestry.com/.../pafg129.htm
freepages.genealogy.rootsweb.ancestry.com/.../pafg400.htm
www.ackermaennchen.de/ahnenforschung/abcg524.htm
http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=AHN&db=volmer&id=I13830
familytreemaker.genealogy.com/.../y/.../UHP-Index.html
http://books.google.com.ar/books?id=-D87AAAAcAAJ&printsec=frontcover&dq=oekonomische&hl=es&ei=TE2GTMWfF4SKlwf1m_zNDg&sa=X&oi=book_result&ct=result&resnum=8&ved=0CEwQ6AEwBzgK#v=onepage&q&f=false
http://books.google.com.ar/books?id=N2wuAQAAIAAJ&pg=RA1-PA48&dq=oeconomische+nachrichten&hl=es&ei=EVKGTJ7sNISclged8fH3Dw&sa=X&oi=book_result&ct=result&resnum=1&ved=0CCUQ6AEwAA#v=onepage&q&f=false