The phrase "invaluable efforts" is correct and usable in written English.
You can use it when referring to a great amount of effort that was put into achieving something. For example, "The team worked long hours and put in invaluable efforts to complete the project on time."
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.
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.
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.
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.
Just last month, Southeast Louisiana Legal Services (SLLS) proved how invaluable these efforts are by helping to convince the Housing Authority of New Orleans (HANO) to lift its ban on providing assistance for affordable housing to low-income people with criminal records.
