- *Join* objects together <kbd>Ctrl</kbd>+<kbd>J</kbd> 

- Select one small edge (edge select type) and search for **Select Similar** > **Lenght**. 

[![enter image description here][1]][1]

- or use **Select Similar > Area** (when in Face select mode)

[![enter image description here][2]][2]


  [1]: https://i.sstatic.net/DmgPj.png
  [2]: https://i.sstatic.net/dnzV4.png