Removal of duplicates in large Microsoft excel files of 2 to 3 GB in size

Hi, I am looking for help in finding software and a freelancer to work and gather huge data in Microsoft excel. These file sizes are 2 to 3 GB of data. You will have to merge these files together and edit them. There are 47 huge excel files with huge data and I need help in pulling these files together and removing all duplicates. You will be working with another freelancer who has started my project. However, we need help in finishing it. If you have any ideas and think you are the person for this job please get back to me.