Isan:
No Footprints in the Blue Sky
talks on Zen

by Osho

talks given live   Nov.-Dec. 1988
Pune, India
book, eBook, mp3 audio, video.
see these links to other sites for availability.
Zen masters Osho talks about in this book:

name in book            Chinese pinyin

Isan...........................Guishan
Hyakujo.....................Baizhang
Reiyu.........................Lingyou (Guishan)
Ling-yu......................Lingyou (Guishan)
Dogo.........................Daowu
Kyozan......................Yangshan
Ta Yuan.....................Dayuan (Guishan)
           oshobob  The Living Workshop                                
                                                        Osho Books