ULAN BATOR, March 15 (Xinhua) -- The inauguration ceremony of a book on China's contribution to the Mongolian infrastructure development was held here on Friday.

"I published this book for the 70th anniversary of diplomatic relations between Mongolia and China," Dashdavaa Naranjargal, author of the book, said at the inauguration ceremony.

Maranjargal hoped the book titled "Chinese workers in the Mongolian People's Republic" can provide Mongolians with a deeper understanding of China's great contribution to the infrastructure development of Mongolia in the 1950s and 1960s.

This year marks the 70th anniversary of the establishment of diplomatic relations between China and Mongolia.

In the 1950s and 1960s, China sent large numbers of workers to Mongolia to help with its infrastructure development. Some of the projects have since become symbols of the Mongolia-China friendship.

Since then, China has consistently contributed to the development of Mongolia.

A development center for children with disabilities, which was build with the assistance of China, was handed over Mongolia on Jan. 24. The center has 250 beds and advanced medical devices and is the first of its kind in Mongolia.