The rationale for conservation has not changed much in the 40 years since this book was prepared. The arguments are set out clearly. Preservation of species is transformative to those who advocate for the microcosm of nature in which species are encountered by citizen scientists, natural historians, and all interested in documenting nature throough artwork, photography, videos and educational materials. This book is for site managers and site visitors alike, and the recent developments in nature literature to the mid-2020s. It has stimulated the National Park network to act benevolently to the nature it conserves, and sets out purposes which have endured. This is useful review of the thinking in the mid-1980s.