The phrase "a useful text" is correct and usable in written English.
You can use it when referring to a piece of writing that provides helpful information or guidance.
Example: "The manual serves as a useful text for understanding the software's features and functionalities."
Alternatives: "an informative document" or "a helpful resource".
That would be a useful text for Mr. Cheney's Christmas card next year.
Mr Nilekani's volume would provide a useful text for such a new lunar society.
Green-Armytage, whose book grew out of an assignment for Life magazine, has also provided a useful text, including a brief history of chicken fancying (Queen Victoria was an early poultry fan) and short descriptions of the breeds pictured, from the Appenzeller Spitzhauben, new on the show circuit, to the showily long-tailed Yokohama.
The basics of economic evaluation in healthcare are described by Donaldson et al. [2] and Drummond et al. [3] provide a useful text book.
Here's one of mine: as a writer, my job comes down to producing a certain amount of useful text regularly.
Although a significant improvement, much useful text is still blocked.
The first section lists a few useful texts for VHSIC hardware description language (VHDL), where VHSIC stands for very high speed integrated circuit.
As a medical clinical virologist, I find Volume II to be a useful reference text.
Transcriptions also contain a large amount of filled pauses and additional disfluent speech events together with useful text.
The BioCreative Interactive task (IAT) is a track designed for exploring user system interactions, promoting development of useful text-mining tools and providing a communication channel for biocuration and text-mining communities (20, 21).
Kidding aside, I can see some useful, text-based apps that could use some interactivity, but what you'd end up with is a Kindle version of a Website.
