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I think you will find that the URL´s in Google´s index are either: indexed prior to putting in the robots.txt disallow in place - check in the google serp and click on "in cache" to see the date. Heavily linked to by other external domains. Both of the above. @cleverphd has a great solution. Follow that.

Thanks for your feedback! I will bears those in mind I meant page title and description, and unfortunately, defining unique content for these fields is not an option. Community, do you think Google will penalize the site (duplicate content penalty) if the only difference between snippets is the publication content data? Thanks in advance!

thanks for your answer, although I am still a bit lost about new options to start with. Analytics world is huge!

Hi Michael, What did you and the client end up deciding? Do you have any lessons learned or anything interesting to share? We'd love to hear it!