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Of that , several thousand acres were identified for seeding or they would come back as medusahead ryegrass or cheatgrass , crowding out valuable forage plants used by livestock and big game . This slow subsidence went on so long as to admit of the accumulation of masses of limestone , shale , and sandstone , several thousand feet in thickness , and probably to bring most of the insular tracts of Central Europe under water . Some combination of the altitude and the long march that my guide , Huang Huaihai , and I have made , several thousand feet up from the city of Lijiang , creates a waveform of emotion ; perhaps it is the resin scent of the foraged pine , perhaps the delicately coasting bees nosing the lavender azalea blooms . In recent years , several thousand students in failing public schools have used government-financed vouchers or private scholarships to attend private schools . As part of the Fleischmann / Foresta grant , several thousand feet of movie film were shot depicting Paiute lifeways ; in addition , the Nevada State Education Department paid for black and white footage which was to be used in Nevada schools . Since 2003 , several thousand refugees a year * with 40 percent of them being from the former Soviet Union * have lost SSI benefits and are living in desperate situations . In Jalal-Abad to the north , several thousand protesters similarly occupied a provincial administration building .