I haven’t heard of this series before, but looking at information from the publisher (Peking University Press) and various booksellers I can see the following:
博雅汉语 = Boya Chinese (1st edition, published around 2004–2009)
- 初级起步篇I = Elementary starter I
- 初级起步篇II = Elementary starter II
- 准中级加速篇I = Pre-intermediate speed up I
- 准中级加速篇II = Pre-intermediate speed up II
- 中级冲刺篇I = Intermediate spurt I
- 中级冲刺篇II = Intermediate spurt II
- 高级飞翔篇I = Advanced hover I
- 高级飞翔篇II = Advanced hover II
- 高级飞翔篇III = Advanced hover III
博雅汉语 = Boya Chinese (2nd edition, published around 2012–2016)
- 初级起步篇I = Elementary I
- 初级起步篇II = Elementary II
- 准中级加速篇I = Quasi-intermediate I
- 准中级加速篇II = Quasi-intermediate II
- 中级冲刺篇I = Intermediate I
- 中级冲刺篇II = Intermediate II
- 高级飞翔篇I = Advanced I
- 高级飞翔篇II = Advanced II
In addition to these main textbooks there are various extras, like the Guide books aimed mainly at teachers and Reading and writing giving extra resources.