“Nature knowledge the most important for young children. It would be well if all we persons in authority, parents and all who act for parents, could make up our minds that there is no sort of knowledge to be got in these early years so valuable to children as that which they get for themselves of the world they live in. Let them once get in touch with nature, and a habit is formed which will be a source of delight through life.” Home Education, by Charlotte M. Mason, volume 1, pg. 61.
A Few Of My Favorite Resources (links to nature study resources)