1. Think about who might collect the data.
2. Look for publications that cite the dataset
3. Once you know that what you want exists, it's time to hunt it down.
A dataset is a building block of a data collection or study. It is a file containing cases or observations, and the data collected for each case are presented in a grid format.
A study is a detailed investigation and analysis of subjects or situations. It is a collection of data containing one or more datasets, as well as codebooks, data collection instrument files, reports, and other related materials, associated with each dataset.