Search database under authors: Senar, J. C. - for no.2 [kept with books at 598.247 SEN] ;
Masriera, Alicia - for no.3 [kept with books at 069.95 MAS] ;
Gomez-Alba, Julio - for no.4 [kept with books at 561.1946 GOM] ;
Under titles: Paseriformes del Occidente de Mexico - for no.5 [kept with books at 598.8 PAS] ;
Spring migration in the western Mediterranean ... - for no.6 [kept with books at 598.294 SPR]
