Student Profile: Jakub Szmuel Roza

I searched Jakub Roza in the database. And there was only one name that came up and the  birthdate matched.

I went to the database and in the Ghetto Note it says A.G. MAERZ 42 In the note underneath it says that A.G. means Change of registration or address/ deported to. So I was thinking the 42 meant a year and the A.G. meant deported. So what does MAERZ mean?  Is it a camp?

I also found this site http://www.yadvashem.org/wps/portal/!ut/p/_s.7_0_A/7_0_2KE/.cmd/acd/.ar/sa.portlet.FromDetailsSubmitAction/.c/6_0_1L5/.ce/7_0_2KI/.p/5_0_2E6?related_key=&DTsearchQuery=&todo=2&images=[%2Fleading_folder%2Falex_lodz.jpg]&imagedescs=[%2Fleading_folder%2Falex_lodz.jpg]&itemid=4620604&q1=SBWkx1%2BCNSo%3D&q2=2IiskXpclBlIfxCkx%2Bs0AXjcpHIc%2FrYk&q3=GQqcToaLMEQ%3D&q4=GQqcToaLMEQ%3D&q5=76O%2Bg41XWkE%3D&q6=jKAhvDcv73k%3D&q7=clartK6sZF6ZF5R8%2FP8257NdFrRSL%2Fkx&npage=&zoomdesc=&victim_details_name=+Ruza+Jakub&fromSearch=yes&victim_details_id=4620604&imagenum=0&searchfor=3&CSRT=13104385532225039739

I searched his name and found someone named Jakub Ruza but he has the same info, ghetto, birthdate, everything.Perphaps a variation of his name? It says his street name and everything in the Ghetto. But I'm not sure if this is him.