The third of six new editions of books by John Ericson is now out, the second edition of Playing Natural Horn Today. Updated for 2018, affordably priced, and available in print and Kindle versions through Horn Notes Edition.
Playing Natural Horn Today, second edition
A concise, modern method for the natural horn, developed with the needs of horn players in mind. This updated second edition is focused toward introducing the natural horn effectively for players who already play the valved horn and wish to learn the older instrument. Topics covered include equipment choices, hand positions, and much more, presented in a practical manner. Short exercises and etudes are included to build technique, making this an ideal resource for learning to play the natural horn.
This is a great resource on the topic, do check it out.