"Milieubescherming. Milieutechnologie." . . "Desarrollo sostenible." . . "Medio ambiente." . . . . "Permaculture magazine"@en . . . . . . . . "Permaculture magazine" . "Periodicals"@en . . . . "Periodicals" . . . . . . "Permaculture" . "Permaculture Magazine [Periodical]" . "Tijdschrift" . . "Permaculture Magazine" . . . "British contemporary press" . "Permaculture magazine" . "Permaculture Association (Britain)" . . "EcologĂ­a." . .