The phrase "amassed material" is correct and usable in written English.
It can be used when referring to a collection or accumulation of resources, information, or items gathered over time.
Example: "The researcher presented her findings based on the amassed material from various studies conducted over the past decade."
Alternatives: "collected resources" or "gathered information".
But even as he amassed material, a play refused to emerge.
Mr. Brooke, whose nearly completed dissertation is titled "Playing the Phonograph," has amassed material on the original tone tests, which featured prominent musicians of the day, including the soprano Anna Case, the baritone Thomas Chalmers and the violinist Albert Spalding, performing next to a phonograph at Carnegie Hall and other concert halls across the country.
For one, the amassed materials have aged accordingly, their kitsch charm acquiring an aftertaste of mildewed madness along the way.
A ghostly figure hovers atop the amassed materials, his or her invisible face demarcated by a frilly collar and decadent cape.
Presiding Judge Richard Hone QC suggested she may have even committed the murder to amass "material" for her future literary endeavours.
But certain people amass material wealth on such a grand scale as to render scarcity nearly meaningless, at least in the short run.
Not only was he named curator of the collection, he was also given a mandate to amass material, aggressively and systematically, organize it and provide access to it.
They never amassed enough material to fuel the thermonuclear processes that cause real stars to shine.
During his travels he had amassed considerable material for a projected comparative lexicon of the English, Latin, Greek, Hebrew, and Celtic languages.
This article argues that specific geographic, military, and topographical conditions created "funnel points" where the Union Army amassed men, material, and animals to sustain its incursions into the South.
Charles McGlashan, a historian, amassed enough material to indict Keseberg for the murder of Tamsen Donner, but after interviewing Keseberg concluded that no murder occurred.
