The objective of the Blue book is to establish an inventory of existing and envisaged standards and parameters of E waterways and ports in Europe and to show, on an internationally comparable basis, the current inland navigation infrastructure parameters in Europe as compared to the minimum standards and parameters prescribed on the Agreement on Main Inland Waterways of International Importance.
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To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.