Faculty of NAS: Biological Science & Agricultural Sciences: Books

Here are some of the popular free eBook sites:

DOAB is a community-driven discovery service that indexes and provides access to scholarly, peer-reviewed open access books and helps users to find trusted open access book publishers. All DOAB services are free of charge and all data is freely available.

Bookboon is an online publishing company of eBooks. It is focused on publishing student literature for   engineering, IT and business students as well as short and practical business books.

On Google Books, you can read books and magazines, download them, cite them, and translate them. 

Project Gutenberg is an online library of free eBooks.

The Internet Archive offers over 20,000,000 freely downloadable books and texts. There is also a collection of 2.3 million modern eBooks that may be borrowed by anyone with a free archive.org account

Open Library is an open, editable library catalog, building towards a web page for every book ever published.

HathiTrust Digital Library is a digital preservation repository and highly functional access platform. HathiTrust provides long-term preservation and access services  to digitized content from a variety of sources, including Google, the Internet Archive, Microsoft, and in-house member institution initiatives.

Biology

570 Life sciences; biology

571 Physiology & related subjects

572 Biochemistry

573 Specific physiological systems in animals

575 Specific parts of & systems in plants

576 Genetics & evolution

577 Ecology

578 Natural history of organisms

579 Microorganisms, fungi & algae

Plants

580 Plants (Botany)

581 Specific topics in natural history

582 Plants noted for characteristics & flowers

583 Dicotyledons

584 Monocotyledons

585 Gymnosperms; conifers

586 Seedless plants

587 Vascular seedless plants

588 Bryophytes

Animals

590 Animals (Zoology)

591 Specific topics in natural history

592 Invertebrates

593 Marine & seashore invertebrates

594 Mollusks & molluscoids

595 Arthropods

596 Chordates

597 Cold-blooded vertebrates; fishes

598 Birds

599 Mammals

Agricultural Science

630 Agriculture & related technologies

631 Techniques, equipment & materials

632 Plant injuries, diseases & pests

633 Field & plantation crops

634 Orchards, fruits & forestry

635 Garden crops (Horticulture)

636 Animal husbandry

637 Processing dairy & related products

638 Insect culture

639 Hunting, fishing & conservation