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	1.	Image from Amazon.com	En busca de antiguos misterios / Alan y Sally Landsburg ; traducción de J. Herrero Aleu. Libro by Landsburg, Alan Material type: Text; Format: regular print ; Literary form: Not fiction ; Audience: General; Publication details: Barcelona : Plaza & Janés, 1977 Availability: Items available for loan: Biblioteca Nacional (1)Call number: CP-BTM-L/232. Place hold Save to lists
	2.	Image from Amazon.com	En busca de extraterrestres / Alan Landsburg ; traducción de R.M. Bassols. Libro by Landsburg, Alan Material type: Text; Format: regular print ; Literary form: Not fiction ; Audience: General; Publication details: Barcelona : Plaza & Janés, 1983 Availability: Items available for loan: Biblioteca Nacional (1)Call number: CP-BTM-L/254. Place hold Save to lists