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.
By 1920, approximately 20.000 glass-negatives of the format 30x30 cm and 40x40 cm had been collected in Germany and abroad.