Throughout the 19th century it continued to be cited as a valuable reference in the cultivation of grass.

What results leaves no room for optimism, but it is a valuable reference.

"But I think it is really a valuable reference," she said.

His dictionary is used world wide by scholars as a valuable reference on Sudanese dialects.

A little challenging to navigate but a valuable reference because of its depth of coverage.

Most other studio views hold their own as quality paintings and all are valuable historical references.

The merger of the two large health care organizations and subsequent failure has provided a valuable reference for other systems with similar plans.

The text is viewed as a valuable reference for Old Japanese linguistics.

Wright's catalogue included excerpts from unpublished texts, and is still a valuable reference even today.

This work is a valuable reference for physicians and pharmacists.