The ECOL operation
Subtitle: ecology + building + common sense
By: by Alvaro Ortega [and others].
Contributors: Ortega, Alvaro, 1920-
Series: Its The problem is, no.2
Published: 1972
Place of publication: Montreal
Language: eng
Number of pages: 100
Subjects: House construction -- Amateurs' manuals.; Sulphur industry.; Building materials.
Notes: Includes bibliographical references.