From their website:
BDFutbol is an independent website dedicated to the recopilation of data and statistics of the spanish football league, including all the seasons from the first division (beginning from 1928-29), second division starting from season 1974-75 and second division B starting from season 2004-05. There is also data from all European competitions, both current and old (counting only statistics of the Spanish league teams). Finally, we also collected all data on the Spanish team, including its youth teams.
The statistical data regarding the first division and second division from 1992 is the LFP official, except for some isolated cases where the LFP data was wrong, confirmed and corroborated by several highly reliable sources. The second division data prior to 1992 has been obtained by consulting various newspaper archives and specialized publications. Data from the second division B from 2007 are basically taken from the official records of the RFEF, except again, some minor errors. Data prior to 2007 were obtained from various sources among which includes newspaper archives, websites, partners, etc.
All information that is in this website (both data and photographs) has been collected personally, either from websites, newspapers and newspaper archives, sports magazines (among which we should highlight Don Balón, Calendarios Dinámico and Marca guides), specialized authors books (mostly Calatrava Vicente Martínez, Félix Martialay and Bernardo de Salazar) and sticker albums (Panini, ESTE, Bruguera, Ruiz Romero, Fher, etc.).
Edited by Hououin Kyouma, 15 May 2012 - 02:51 AM.