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Find the most profitable Kindle niche categories

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Category name Best seller rank 50th book's rank Median sales($) Median price ($) Volatility (%) New releases (%) Self pub.(%) KDP Select (%) Competition
Books > Engineering & Transportation > Engineering > Materials & Material Science 18,342 250,531 $478 $17.1 95% 0% 30% 0% ~ 40,000
Books > Engineering & Transportation > Engineering > Materials & Material Science > Materials Science 25,742 272,708 $600 $21.45 100% 5% 20% 3% ~ 30,000
Books > Engineering & Transportation > Engineering > Materials & Material Science > Metallurgy 23,051 298,999 $401 $14.34 90% 0% 30% 7% ~ 5,000
Books > Engineering & Transportation > Engineering > Materials & Material Science > Polymers & Textiles 64,495 638,857 $1,906 $68.09 95% 5% 5% 3% ~ 6,000
Books > Engineering & Transportation > Engineering > Materials & Material Science > Concrete 24,222 661,475 $1,207 $43.12 95% 5% 0% 0% ~ 3,000
Books > Engineering & Transportation > Engineering > Materials & Material Science > Strength of Materials 186,310 1,155,367 $0 $100.28 100% 0% 15% 0% ~ 1,000
Books > Engineering & Transportation > Engineering > Materials & Material Science > Testing 86,582 1,219,587 $0 $105.42 100% 0% 30% 0% ~ 5,000
Books > Engineering & Transportation > Engineering > Reference > Architecture > Methods & Materials 3,129 1,731,876 $762 $27.23 95% 5% 10% 0% ~ 3,000
Books > Engineering & Transportation > Engineering > Materials & Material Science > Fracture Mechanics 25,650 2,082,690 $0 $44.16 95% 5% 30% 17% ~ 1,000
Books > Christian Books & Bibles > Churches & Church Leadership > Church Materials 11,186 2,759,775 $269 $9.62 100% 0% 10% 0% ~ 469
Books > Medical Books > Dentistry > Dental Materials 32,265 3,226,138 $0 $26.99 100% 20% 65% 3% ~ 350
Books > Engineering & Transportation > Engineering > Materials & Material Science > Extraction & Processing 154,614 6,893,679 $0 $97.47 100% 5% 10% 0% ~ 3,000