Descriptions of the events reported at Fátima were collected by Father John De Marchi, an Italian Catholic priest and researcher. De Marchi spent seven years in Fátima, from 1943 to 1950, conducting research and interviewing the principals at length. In "The Immaculate Heart", published in 1952, De Marchi reports that, "heir ranks (those present on 13 October) included believers and non-believers, pious old ladies and scoffing young men. Hundreds, from these mixed categories, have given formal testimony. Reports do vary; impressions are in minor details confused, but none to our knowledge has directly denied the visible prodigy of the sun."