F. Jansson notes that Karski already made a visit to a German camp for Jews in Belzec in 1939. Wood and Jankowski write, about this visit :
one of Marian's [Marian is the brother of Karski] subordinates on the police force, a Jew, was planning to cross to the Soviet occupied zone of Poland (...) Marian (...) decided to send Jan wih him to Lwow. (...) Departing at a village and hitching a ride from the station on a peasant cart, Jan and the policeman reached the town of Belzec (...). Walking to the ouskirts of Belzec, they located the guide whose name they had been given. (...) The Germans (...) did make efforts to keep Jews from escaping. (...) Jan, stuck in Belzec (...), saw what happened to those who were caught.
In his report to the government-in-exile early in 1940, Jan described the tableau of misery he witnessed :
"Near Belzec, the Germans have created a camp of Jews... An enormous proportion walked and slept under the open sky. Very many people were without proper clothing or other covering. (...) a heard of harassed beasts, not people."
(Wood and Jankowski, Karski..., 2014 edition, p. 36-37.)
Now, the "1942" visit. In an article "Eye-Witness Report of a Secret Courier Fresh from Poland", in Voice of the Unconquered, March 1943, Karski says :
In the uniform of a Polish policeman I visited the sorting point near Belzec. It is a huge barrack only about half of which is covered with a roof. When I was there about 5,000 men and women were in the camp. (...) (...) they are no longer in the image of men. Skeletons with eyes dead with resignation. Naked, frightened (...)
(Quoted in Mattogno, Belzec, 2004, p. 26-27.)
In the 1944 book, written by Karski and Emery Reves, there is a hay cart, but instead of a Polish uniform, Karski wears an Estonian one. And there is no Jew in the expedition, the companion of Karski is an Estonian. (Jan Karski, Story of a Secret State, Penguin Classics, 2012, p. 369 ff.)
In the winter 1978-1979, Karski has an interview with Lanzmann. The transcript of the interview is online here :
http://data.ushmm.org/intermedia/film_v ... 28385C.pdf
Karski says first (p. 31) that his companion was a Jew, but after a change of roll, he realigns himself with the 1944 book : the companion was an Estonian (p. 35).
Don't you think that the "1942" visit was constructed from the 1939 visit ?