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		No cover image available Enfants difficiles parents perplexes / René Ledent et Lucien Wellens. by Ledent, René Wellens, Lucien [coaut.] Material type: Text; Format: print ; Literary form: Not fiction Publication details: Liége : Vaillant-Carmann, [1940?] Availability: Items available for loan: Bib. Gregorio Torres Quintero (1)Collection, call number: Colección General BF721 L4.3. Place hold
		No cover image available Les enfants traduits en justice : étude d'aprés trois cents dossiers du tribunal pour... by Racine, Aimee Luna de Ibarra, Luz [propietaria anterior] Instituto Nacional de Investigación Educativa (México) [propietario anterior] Material type: Text; Literary form: Not fiction Language: Spanish Publication details: Liége : G. Thone, 1935 Availability: Items available for reference: Bib. Gregorio Torres Quintero: Disponible (Previa cita) (1)Collection, call number: Fondo Reservado de libros HV9096 F8 R3.3.
		No cover image available Précis de biométrie : a l'usage des médecins et éducateurs by Ledent, René Wellens, Lucien Decroly, Ovide, 1871-1932 [prefacio] Luna de Ibarra, Luz [propietaria anterior] Instituto Nacional de Investigación Educativa (México) [propietario anterior] Edition: 2a ed. Material type: Text; Literary form: Not fiction Language: French Publication details: Liege : Vaillant-Carmanne, 1928 Availability: Items available for reference: Bib. Gregorio Torres Quintero: Disponible (Previa cita) (1)Collection, call number: Fondo Reservado de libros GN60 L4.6 1928.