Tania's Crunchbase Rankings 2018-19
You can see for yourself: Amazon Books ranks bestsellers by sales and number of reads. To qualify, you must reach the "Top 3000" of the ca 3 million books monitored by their algorithms for any category.
Getting into the Top 1000 globally is therefore a pretty big achievement!
Without any marketing or book launches at all, my key text
Artificial Intelligence as 3D Literature & Suspending Disbelief when Chatting with Bots: The Making of velmai's AI Bots
has sustained its bestseller status in 3 categories in the Amazon ranking internationally, including in the best 700 titles for "Robotic Engineering".
Amazon Books ranks bestselling works on their platform
Since 2015, the Amazon bookstore has been selling my Kindle ebooks and hardcovers with KDP Publishing, evidence of the Long Tail sales strategy working!