If you're interested in finding out more about Units of Study, check out these resources!
DESE
The Missouri Department of Elementary and Secondary Education has posted model curriculum units for each grade level in most subject areas. Take a look at what they have available by clicking on the link below. From the link, you just select your grade level.
EngageNY
One really good resource is EngageNY.org. This site is developed and maintained by the New York State Education Department as has been cited as a suggested resource when seeking ideas for CCSS. They have their curriculum divided into "modules" which are Units of Study. Please keep in mind that this is a RESOURCE for us to study and not a curriculum to follow. Their units can be a bit overwhelming at first! :)
Article
A Unit of Study Approach for Teaching Common Core State Standards for Writing from the Association for Middle Level Education