"invaluable effort" is a correct and usable phrase in written English.
You can use it to describe efforts that are not easily measured in terms of tangible benefits, but are nonetheless highly valuable and appreciated. For example: "The volunteer put in innumerable hours of invaluable effort to help raise money for the charity."
And it leads the community's open source activities through the Open Source Center, an invaluable effort that informs Community analysis and helps guide the intelligence community's other efforts.
Girardi does not have "star" statistics (3 goals, 12 assists), but is being rewarded for his invaluable effort during the first half of the season with defensemen Marc Staal and Michael Sauer sidelined by concussions.
The authors wish to thank Professor M.D. Niels Egund, from the Department of Radiology at Aarhus University Hospital, for his invaluable effort during the radiological assessments in the study.
The pre-publication history for this paper can be accessed here: http://www.biomedcentral.com/1471-2458/12/308/prepub wouldulikeike to thank our data collectors for their invaluable effort without them this study would not have come to be completed.
The two teams are making invaluable efforts.
We thank all the field assistants (in particular Bo Nielsen) for their invaluable efforts in the field.
Mr. Shawer provided invaluable efforts in acquiring and assembling data for this study.
We would like to thank Dina Kakar, MD, MSc for her invaluable efforts.
Nonetheless, it is important to acknowledge that many such organisations exist and provide invaluable efforts to advancing global surgery.
We thank all participants and the invaluable efforts of the GCRC nursing staff, Celia Darland, CDE (research dietician) and associated personnel.
The pre-publication history for this paper can be accessed here: http://www.biomedcentral.com/1472-6823/11/8/prepub Miss Q Duba is acknowledged for the invaluable efforts in making available the case notes that were reviewed.
