Carlo Mattogno has a new article out called Incontrovertible Facts on Cremations in National-Socialist “Extermination Camps”.
https://codoh.com/library/document/inco ... ion-camps/
He covers all the bases from the ovens at Auschwitz to open air cremations at the Reinhardt camps, Auschwitz, and Aktion 1005 for the Einsatzgruppen. He also covers the 2018 Australian open air cremation experiment and revises his previous wood estimates upward based on it. Of course, it's not as detailed as several of the HH books (an article can't cover all the details those longer books have) but it is a necessary update for the technical aspects of both open air and oven cremations at the alleged crime scenes. Check it out!