SELECT datosbiblio.control_hx, datosbiblio.control_dgb,  
datosbiblio.nombre, datosubdep.nom_subdepen, datosdepen.nom_depen 
FROM datosbiblio, direccion, datosdepen, datosubdep

WHERE datosbiblio.bib_id = direccion.bib_id

AND direccion.dep_id = datosdepen.dep_id

AND direccion.bib_id > 0
                       
AND datosbiblio.subsistema != ''
		       
AND direccion.subdep_id=datosubdep.subdep_id
		       
AND (datosbiblio.control_hx is not null OR datosbiblio.control_dgb is not null)
		       
ORDER BY datosbiblio.control_dgb"