00483nam a22001457a 4500003000400000005001700004008004100021040001400062100002200076245007800098260000900176300002800185500009100213504003300304OSt20171010095238.0110815t        xxu||||| |||| 00| 0 eng d  aMMSUcULS  aDe la Cruz, Efren  aStrategic intervention materials on ecological conceptscEfren de la Cruz  c2007  axii, 172 leavesc28 cm.  aThesis (M.A.Ed-Biology) -- Mariano Marcos State University-Graduate School, Laoag City  aBibliography: leaves 141-143