Foreword 10
Chapter 1：Clark and China 13
1.1．Robert Sterling Clark 14
1.2．A Noble Personality 18
1.3．Through Shên-Kan,One Century Later 21
Chapter 2：Sowerby and Clark 35
2.1 Arthur de C.Sowerby 36
2.2 Clark and Sowerby:Longtime Friendship and Contributions to Chinese Culture 39
Chapter 3：Revisiting Loess Plateau 45
3.1．Shanxi 46
3.2．Shaanxi 86
3.3．Gansu and Ningxia 174
Chapter 4：Author's Note 213
4.1．My Experiences On Route 214
4.2．Acknowledgments 226
Chapter 5：Appendix 229
5.1．THE SOWERBY SAGA—(Part relevant to Through Shên-Kan) 230
5.2．A Brief Chronicle of Sowerby 252
5.3．The monographs and articles by Sowerby 255
5.4．References 255