Question About Issue Date Of German Semi-Postal Stamps

Hello All,
I have a question about the dates when several German semi-postal stamps were issued in the 1940's. Scott's doesn't have the exact date for the following stamps:
B278-B279 1944 7th National Shooting Matches
B280 1944 Albert University
B281-B282 1944 Reich Labor Service
and
B284-B285 1944 Vienna Grand Prize Race

I know they were issue in July to August of 1944, but not the day. I have them on cover with "commemorative" postmarks, but wondering if they are first day covers or not. Does anyone have a Michel or other catalog with better information?
Thanks,
Will

If I'm reading Michel right, July 2 for the University and Shooting match issues. No specific date for the others. June for the workers, August for the Vienna race.

Thanks for the help! Merry Christmas as well!

Here's pics of two of the items in question: