Thank you both Partsguy5 and DThomas for sharing views. I also doubt very much of their authenticity and won't take the risk of loosing money. I am in need of BT, Komatsu, Clark & Nissan manuals. However, I was able to find some other source from the internet sometime back and did purchase manuals. He does not have the manuals I am now looking for. I can send you his contact in case you are interested. mail me : dhammika(underscore)umpl(at)stmail (dot)lk