Centuries: 7th century - 8th century - 9th century
Decades: 690s 700s 710s 720s 730s - 740s - 750s 760s 770s 780s 790s
Years: 739 740 741 742 743 - 744 - 745 746 747748 749
Algal blooms in lakes and rivers may be caused by greatly increased amounts of phosphorus or nitrogen entering an aquatic ecosystem from either sewag ...
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