The book is certainly an asset for serious researchers as also for all those who have some interest in architectural history and heritage.

A permit is required for serious researchers to work inside the valley.

During his life he was always willing to share access to the material with serious researchers.

It is just as well that I am not a serious researcher of times past.

He fancied himself a serious scientific researcher when in fact he was just an engineer.

But he deeply appreciated and respected serious researchers, whatever their orientation or philosophy.

Knowledge, as most serious researchers will concede, is rarely power.

All this is "for the serious researcher as well as the Sunday museumgoer," said one person who had seen a working version of the site.

These materials were available to serious researchers at the park's resource center until its closure in 2007.

That idea is considered absurd by serious researchers.