By 1920, approximately 20.000 glass-negatives of the format 30x30 cm and 40x40 cm had been collected in Germany and abroad.
baɪ nˈaɪntiːnhˈʌndɹɪd twˈɛnti, ɐpɹˈɑːksɪmətli twˈɛnti.zˈiəɹoʊzˈiəɹoʊ zˈiəɹoʊ ɡlˈæsnˈɛɡətˌɪvz ʌvðə fˈɔːɹmæt θˈɜːɾi ˈɛks θˈɜːɾi sˌiːˈɛm ænd fˈoːɹɾi ˈɛks fˈoːɹɾi sˌiːˈɛm hɐdbɪn kəlˈɛktᵻd ɪn dʒˈɜːməni ænd ɐbɹˈɔːd.