I recommend the following books about landscape painting. Start with Kevin Macpherson's books for your first foray into the subject.
by Kevin Macpherson
Start here, this basic book covers the basic building blocks of painting - seeing color, mixing color, light and shadow and seeing shapes with a focus on small plein air studies.
A follow-up to Kevin's first book takes plein air sketches into the studio for larger works. A masterful breakdown on the creative process and design.
A classic must-read, but not an easy read. This book is dense on text, short on illustrations and requires attentive reading. For the serious artist, but well worth the effort. You will find something new with every reading.
A compilation of the best from many good books on the subject of landscape painting, including technical and equipment difficulties. The author accurately sets up the challenges of painting light with pigment. If you didn't know what you were up against as a painter, you will once you read this book. The solutions are what your journey as an artist is about.
An excellent study of design and composition with a focus on landscape and still life. The leap from "a painting is a picture of things" to "a painting is the abstract design behind the shapes" is a difficult concept to grasp. This book will move you from making pictures to creating paintings.
A classic by one of the greats of the golden age of landscape painting. Text-dense and a challenge to read. Don't tackle this until you are well into the subject.
by Kevin Macpherson
by John Carlson
by Mitchell Albala
by Ian Roberts
by Edgar Payne