| His hundreds of sketchbooks were invaluable aide-memoire, and he kept them well organized so he could quickly locate what he wanted. |
| A lot of invaluable literature in the languages of the common folk has remained outside recognised literary boundaries. |
| It was an invaluable experience, though, and he passed a coaching course that qualifies him to manage a fourth division side. |
| They are going through a transitional period but the kids are gaining invaluable experience. |
| Vintage woodworking machinery trade catalogs have proved invaluable in uncovering the history of some of these companies. |
| The Folger's collections have proved invaluable to a project we have undertaken on Africanism in early modern England and English America. |
