Why?

I'm working hard, as usual, but my work could be simpler if there were books and teacher's manuals for two of my subjects. It's a real pain in the ass to create lessons out of whole cloth. I'm not a scientist or historian. I know a lot about both subjects but not enough to create curriculum and materials for them. Why would the school district do this? So I've been cutting and pasting everything I can find to create weeks of lessons. It's really aggravating because I don't have the time to do this work. I've got enough on my plate with teaching and classroom management. There's no time left for me to become a researcher too. Still, I've got to do it or face the wrath of the administration.