الرئيسيةبحث

صورة:Soil sci.jpg


Soil scientist 360x458 109.66 KB KB

Public domain This image is a work of a United States Department of Agriculture employee, taken or made during the course of the person's official duties. As a work of the U.S. federal government, the image is in the public domain.

source

http://soils.usda.gov/education/resources/k_12/lessons/profile/soil_sci.jpg

الصفحات التالية تحتوي على وصلة لهذه الصورة: