obstáculos y perspectivas UNESCO text programmed text sp 1977 1 ed. monographic SPA

print

87 p. : il. ; 19 cm. specialized Título original: Development of arid and semi-arid lands: obstacles and prospects DESIERTOS REGIONES ARIDAS 333.73 D47 1982 8485800281 (SERBAL) 9233014843 (UNESCO) https://www.cicy.mx/sitios/sib/doctoelectronico/411.pdf https://www.cicy.mx/sitios/sib/doctoelectronico/411.pdf 110619 20260521090049.0 000000411