Create Adabiyotlar Internet

1. https://e-library.sammu.uz/uz/book/1842

2. https://e-library.sammu.uz/uz/book/3414

3. https://library.ziyonet.uz/ru/book/4940

4. https://www.wildberries.ru/catalog/440565389/detail.aspx

5. https://archive.org/details/environmentalhea0000moel