diff --git a/AUTHORS.md b/AUTHORS.md
index 1a6ad098..f4052fe3 100644
--- a/AUTHORS.md
+++ b/AUTHORS.md
@@ -5,5 +5,6 @@ It was initially inspired by the openpyxl library: https://openpyxl.readthedocs.
 Thanks to everyone who has contributed to this project (in alphabetical order):
 
 * Malvineous
+* xpol
 
-Project logo designed by Thomas Fussell.
\ No newline at end of file
+Project logo designed by Thomas Fussell.
diff --git a/source/workbook/tests/test_workbook.hpp b/source/workbook/tests/test_workbook.hpp
index 6d354b93..e7647d14 100644
--- a/source/workbook/tests/test_workbook.hpp
+++ b/source/workbook/tests/test_workbook.hpp
@@ -76,6 +76,17 @@ public:
         TS_ASSERT_EQUALS(new_sheet, found_sheet);
     }
     
+    void test_get_sheet_by_name_const()
+    {
+        xlnt::workbook wb;
+        auto new_sheet = wb.create_sheet();
+        std::string title = "my sheet";
+        new_sheet.set_title(title);
+        const xlnt::workbook& wbconst = wb;
+        auto found_sheet = wbconst.get_sheet_by_name(title);
+        TS_ASSERT_EQUALS(new_sheet, found_sheet);
+    }
+
     void test_index_operator() // test_getitem
     {
         xlnt::workbook wb;
diff --git a/source/workbook/workbook.cpp b/source/workbook/workbook.cpp
index fa860494..0d848d6a 100644
--- a/source/workbook/workbook.cpp
+++ b/source/workbook/workbook.cpp
@@ -98,7 +98,7 @@ workbook::workbook(encoding e) : workbook()
     d_->encoding_ = e;
 }
 
-worksheet workbook::get_sheet_by_name(const std::string &name)
+const worksheet workbook::get_sheet_by_name(const std::string &name) const
 {
     for (auto &impl : d_->worksheets_)
     {
@@ -111,6 +111,11 @@ worksheet workbook::get_sheet_by_name(const std::string &name)
     return worksheet();
 }
 
+worksheet workbook::get_sheet_by_name(const std::string &name)
+{
+	return worksheet(static_cast<const workbook*>(this)->get_sheet_by_name(name));
+}
+
 worksheet workbook::get_sheet_by_index(std::size_t index)
 {
     return worksheet(&d_->worksheets_[index]);
diff --git a/source/worksheet/tests/test_worksheet.hpp b/source/worksheet/tests/test_worksheet.hpp
index 689f8153..5d0e63d2 100644
--- a/source/worksheet/tests/test_worksheet.hpp
+++ b/source/worksheet/tests/test_worksheet.hpp
@@ -152,6 +152,36 @@ public:
             expected_row_iter++;
         }
     }
+
+    void test_iter_rows_offset_int_int()
+    {
+        xlnt::workbook wb;
+        xlnt::worksheet ws(wb);
+        auto rows = ws.rows(1, 3);
+
+        const std::vector<std::vector<std::string>> expected =
+        {
+            { "D2", "E2", "F2" },
+            { "D3", "E3", "F3" },
+            { "D4", "E4", "F4" },
+            { "D5", "E5", "F5" }
+        };
+
+        auto expected_row_iter = expected.begin();
+
+        for (auto row : rows)
+        {
+            auto expected_cell_iter = (*expected_row_iter).begin();
+
+            for (auto cell : row)
+            {
+                TS_ASSERT_EQUALS(cell.get_reference(), *expected_cell_iter);
+                expected_cell_iter++;
+            }
+
+            expected_row_iter++;
+        }
+    }
     
     void test_get_named_range()
     {
diff --git a/source/worksheet/worksheet.cpp b/source/worksheet/worksheet.cpp
index 965c2723..31336292 100644
--- a/source/worksheet/worksheet.cpp
+++ b/source/worksheet/worksheet.cpp
@@ -627,6 +627,12 @@ xlnt::range worksheet::rows(const std::string &range_string, int row_offset, int
     return get_range(reference.make_offset(column_offset, row_offset));
 }
 
+xlnt::range worksheet::rows(int row_offset, int column_offset) const
+{
+    range_reference reference(calculate_dimension());
+    return get_range(reference.make_offset(column_offset, row_offset));
+}
+
 xlnt::range worksheet::columns() const
 {
     return range(*this, calculate_dimension(), major_order::column);